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Vollmer, R., Etzkorn, M., Anil Kumar, P. S., Ibach, H., Kirschner, J.

Spin-polarized electron energy loss spectroscopy: A method to measure magnon energies
Journal of Magnetism and Magnetic Materials 272-276, (3),pp 2126-2130 (2004)
Spin-polarized electron energy loss spectroscopy is demonstrated to be an effective and unique tool to determine spin-wave dispersion curves of surfaces and ultrathin films over the whole Brillouin zone. The spin-wave dispersion curve of 8 monolayer Co on Cu(0 0 1) along the <1 1 0>-direction has the shape of a thin film spin dispersion curve with zero slope at the surface Brillouin zone. The cross-section of magnon excitation depends strongly on the energy E0 of the incident electrons and has a maximum around E0=7 eV.